EP1507258A2 - Magnetbandlaufwerk - Google Patents

Magnetbandlaufwerk Download PDF

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Publication number
EP1507258A2
EP1507258A2 EP04015902A EP04015902A EP1507258A2 EP 1507258 A2 EP1507258 A2 EP 1507258A2 EP 04015902 A EP04015902 A EP 04015902A EP 04015902 A EP04015902 A EP 04015902A EP 1507258 A2 EP1507258 A2 EP 1507258A2
Authority
EP
European Patent Office
Prior art keywords
magnetic tape
guide
guides
tape drive
nitride
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04015902A
Other languages
English (en)
French (fr)
Other versions
EP1507258A3 (de
Inventor
Toru c/o Fuji Photo Film Co. Ltd. Nakao
Masahiko c/o Fuji Photo Film Co. Ltd. Asai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Fuji Photo Film Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp, Fuji Photo Film Co Ltd filed Critical Fujifilm Corp
Publication of EP1507258A2 publication Critical patent/EP1507258A2/de
Publication of EP1507258A3 publication Critical patent/EP1507258A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/66—Threading; Loading; Automatic self-loading
    • G11B15/67—Threading; Loading; Automatic self-loading by extracting end of record carrier from container or spool
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/605—Guiding record carrier without displacing the guiding means

Definitions

  • the present invention relates to a magnetic tape drive for recording/reproducing magnetic information for a magnetic tape.
  • a magnetic tape drive is equipped with a travel device for running a magnetic tape and a plurality of guides for guiding the magnetic tape, which runs, along a predetermined route (for example, see paraphrase 0058 and FIG. 1 in Japanese Patent Laid-Open Publication 2002-530791).
  • a running magnetic tape is designed to be hung across a plurality of guides arranged at predetermined positions.
  • each of these guides is configured, as well known, of a roller portion of a cylindrical shape freely rotationally supported by a shaft around a center axis and a flange portion arranged on up/down ends of each roller.
  • the magnetic tape drive it is designed so that magnetic information is sent to a magnetic head while a magnetic tape, which is received on a periphery of the roller portion, is regulated in a lateral directional movement thereof by the flange portion; thereby the magnetic information is recorded on the magnetic tape; and the recorded magnetic information is reproduced.
  • a groove G is dug into a flange portion 20a of a guide 20 where an edge of a magnetic tape MT abrades as use times of a magnetic tape drive are repeated.
  • This tendency noticeably appears in a magnetic tape drive where a running speed of a magnetic tape is heightened and magnetic information is recorded/reproduced at a high speed.
  • the magnetic tape MT guided by the guide 20 is oscillated in lateral directions (in up/down directions in FIG. 9) by the groove G in order of a micro meter ( ⁇ m).
  • the inventor has found that when in each of a plurality of guides arranged at a magnetic tape drive a ratio of a peripheral speed of each guide for a running speed of a magnetic tape becomes lower than a predetermined value, a flange portion of the guide is peculiarly ground by the magnetic tape, and thereby has reached the present invention.
  • a first aspect of the present invention to solve the problem is a magnetic tape drive comprising a travel device for running a magnetic tape and a plurality of guides guiding the magnetic tape, which is running, along a predetermined route, and a surface hardening treatment is dispensed to a relevant guide out of the guides, whose ratio of a peripheral speed for a running speed of the magnetic tape is not more than 0.9.
  • the magnetic tape drive when the travel device runs the magnetic tape while the guides guide it along the predetermined route, the magnetic tape is regulated by flange portions of the guides in a movement of lateral directions thereof.
  • the surface hardening treatment is dispensed to the relevant guide out of the guides, whose ratio of the peripheral speed for the running speed of the magnetic tape is not more than 0.9, that is, the guide where a difference between the running speed of the magnetic tape and a rotation speed of the guide is not less than the predetermined value, the flange portion of the relevant guide becomes difficult to be ground by edges of the magnetic tape. Accordingly, even when the magnetic tape drive is used over a long period, the magnetic tape is not oscillated in the lateral directions thereof.
  • the wrap angle described here means a range of a plane angle where the magnetic tape hung across a periphery of a guide contacts the periphery, that is, a contact angle (see FIG. 2B).
  • the surface hardening treatment is preferable to be dispensed to the relevant guide out of the guides, whose ratio of the peripheral speed for the running speed of the magnetic tape is not more than 0.9 and whose wrap angle of the magnetic tape is not more than 90 degrees.
  • FIGS. 8A and 8B is a partial section drawing of a guide used in a magnetic tape drive related to other embodiments.
  • FIG. 9 is a conceptual drawing showing a guide used in a conventional magnetic tape drive.
  • FIG. 1 is a schematic drawing of a magnetic tape drive related to an embodiment of the present invention
  • FIG. 2A is a perspective view showing a state around a guide used in the magnetic tape drive of FIG. 1
  • FIG. 2B is a pattern drawing showing a state where a magnetic tape contacts a guide used in the magnetic tape drive of FIG. 1
  • FIG. 3 is a partial section drawing of a guide used in the magnetic tape drive of FIG. 1 when the guide is cut at a plane along a rotation axis thereof.
  • the drive exemplified in the embodiment is one according to the LTO standard (Linear Tape-Open) and is designed to record/reproduce magnetic information at a high speed even when a magnetic tape of a magnetic tape cartridge runs in any forward/reverse of bi-directions.
  • LTO standard Linear Tape-Open
  • a drive A related to the embodiment comprises a first gear 11a and a second gear 11b; a reel 12; a magnetic head 14; a first guide 15a and a second guide 15b (simply referred to as "guide 15" when not specifying a guide); drive motors not shown for driving the first gear 11a and the second gear 11b, respectively; and a casing 16 for housing the members 11a, 11b, 12, 14, 15a, and 15b.
  • the first gear 11a rotates a reel 17 of a magnetic tape cartridge MC loaded in the drive A and is designed to rotate in any forward/reverse of bi-directions by a drive motor not shown.
  • the reel 12 (hereinafter referred to as a "drive-side reel 12") winds a magnetic tape MT, which is sent out from the reel 17 (hereinafter referred to as a “cartridge-side reel 17") of the magnetic tape cartridge MC, and sends out the magnetic tape MT, which is wound, to the cartridge-side reel 17.
  • the second gear 11b rotates the drive-side reel 12 in a direction opposite to a rotation direction of the cartridge-side reel 17 and is designed to rotate in any forward/reverse of bi-directions of a by a drive motor not shown.
  • the magnetic head 14 records magnetic information on the magnetic tape MT, which reciprocates between the cartridge-side reel 17 and the drive-side reel 12, and also reproduces the recorded magnetic information.
  • a compound head which comprises a read element such as a magnetoresistive effect element and a write element such as an electromagnetic induction element.
  • the magnetic head 14 is arranged so as to be able to contact the magnetic tape MT, which runs with being guided to a predetermined route by the guide 15 described next.
  • the first guide 15a and the second guide 15b guide the magnetic tape MT, which is sent out from the magnetic tape cartridge MC (cartridge-side reel 17), so as to head for the drive-side reel 12 via the magnetic head 14; and otherwise guide the magnetic tape MT, which is wound on the drive-side reel 12, so as to head for the cartridge-side reel 17 via the magnetic head 14.
  • first guide 15a and second guide 15b is determined a running route of the magnetic tape MT in the drive A.
  • such the guide 15 is designed to be supported by a rotation shaft 15c, which extends to a vertical direction of the casing 16, and to be able to rotate around the rotation shaft 15c.
  • the guide 15 is designed so that a flange portion 15e thereof regulates a movement of lateral directions of the running magnetic tape MT while the guide 15 itself rotates by the running magnetic tape MT being hung across a periphery of a roller portion 15d thereof.
  • the running magnetic tape MT which is hung across such the guide 15, contacts a periphery thereof in a range of opening at a predetermined angle ⁇ from a center C of the rotation shaft 15c.
  • the contact angle is referred to as a wrap angle.
  • the wrap angle ⁇ in the first guide 15a gradually becomes small as the magnetic tape MT is sent out from the cartridge-side reel 17 to the drive-side reel 12; the wrap angle ⁇ in the second guide 15b gradually becomes small as this sent-out magnetic tape MT is wound on the drive-side reel 12.
  • the wrap angle ⁇ in the second guide 15b gradually becomes large as the magnetic tape MT is sent out from the drive-side reel 12 to the cartridge-side reel 17; the wrap angle ⁇ in the first guide 15a gradually becomes large as this sent-out magnetic tape MT is wound on the cartridge-side reel 17.
  • the guide 15 is arranged at positions where the wrap angle ⁇ , which thus fluctuates when the magnetic tape MT reciprocates between the cartridge-side reel 17 and the drive-side reel 12, always becomes not more than 90 degrees.
  • the wrap angle ⁇ is set in such the range, and thereby the drive A is designed so that a frictional resistance of the magnetic tape MT for the first guide 15a and the second guide 15b is reduced, a high speed running of the magnetic tape MT can be made, and magnetic information for the magnetic tape MT is quickly recorded/reproduced.
  • a ratio of a peripheral speed of the roller portion 15d for a running speed of the magnetic tape M (hereinafter simply referred to as a "rotation following ratio of the guide 15") is designed to be not more than 0.9 when the magnetic tape MT is run by a travel device.
  • a hardening treatment such as a soft-nitrizing treatment, carburizing and quenching, and induction hardening is dispensed to the base metal B or a hard film is formed on the surface of the base metal B, for example, by a known thin-film-forming method such as a sputtering method.
  • the material of the hardened layer H is not specifically limited, and for example, are cited titan nitride (TiN), chromium nitride (CrN), titan aluminum nitride (TiAlN), tungsten carbide-cobalt (WC-Co), diamond-like carbon (DLC), and the like. Meanwhile, in the hardened layer H, which is formed on the base metal B, a polish treatment may also be dispensed so that a surface thereof becomes a predetermined smoothness.
  • the magnetic tape cartridge MC is loaded in the drive A and the first gear 11a and the second gear11b are rotated by drive motors not shown, and thereby the magnetic tape MT wound on the cartridge-side reel 17 is sent out to the drive-side reel 12; This sent-out magnetic tape MT is wound to the drive-side reel 12 and thereby runs between the cartridge-side reel 17 and the drive-side reel 12.
  • first guide 15a and the second guide 15b guide the running magnetic tape MT so as to contact the magnetic head 14. Because at this time each wrap angle ⁇ of the first guide 15a and the second guide 15b is set to become a range of not more than 90 degrees, a frictional resistance of the magnetic tape MT for the guide 15 is reduced. As a result, because the magnetic tape MT can be stably run at a high speed, magnetic information can be recorded/reproduced at a high speed for the magnetic tape MT. On the contrary, because in the first guide 15a and the second guide 15b the wrap angle ⁇ is set in a range of not more than 90 degrees and a contact area of the guide 15 and the magnetic tape MT is reduced, the rotation following ratio of the guide 15 becomes not more than 0.9. That is, a difference occurs between a running speed of the magnetic tape MT and a peripheral speed of the guide 15.
  • the flange portion 15e thereof becomes difficult to be ground.
  • the drive A does not generate a tracking error, not depending on recoding density of the magnetic tape MT loaded therein being high or low, and can be used for an inspection of the magnetic tape MT and a library over a long period.
  • the drive used in the abrasion resistance test is, as shown in FIG. 4, designed so that the magnetic tape MT, which runs between a pair of reels R1 and R2, is guided along a predetermined route by guides arranged at positions #1, #2, #3, and #4. And out of these guides, on peripheries of guides arranged at the positions#2 and #3 a groove not shown is formed and adjusts a running speed of the magnetic tape MT and peripheral speeds of rotating guides so as to become nearly equal, that is, each the rotation following ratio of the guides approximates 1.
  • a guide arranged at the position #1 is used a stainless steel guide, where a hardened layer of titan nitride (TiN) is formed on a surface thereof.
  • a rotation speed which is described in a column of "Finish-Side Speed" in Table 1, is that of each guide when finishing to send the magnetic tape MT from the reel R1, that is, when the magnetic tape MT is at a position Y in FIG. 4.
  • Rotation Speed of Guide (rotation per second): The Present Invention Guide No. Forward Direction Reverse Direction Start-Side Speed Finish-Side Speed Start-Side Speed Finish-Side Speed #1 78 16 21 17 #2 164 164 164 164 #3 165 164 165 164 #4 48 40 87 164
  • a sample provided for this observation (hereinafter referred to as a "guide sample”) is something that is cut out from the guide 15 with leaving the flange portion 15e.
  • FIG. 6 is a microscope photo of a #1 guide sample when running the magnetic tape MT.
  • Rotation Speed of Guide (rotation per second): Comparison Example Guide No. Forward Direction Reverse Direction Start-Side Speed Finish-Side Speed Start-Side Speed Finish-Side Speed #1 74 20 20 17 #2 165 165 165 165 #3 164 164 164 164 #4 66 57 93 163
  • FIG. 7 is a microscope photo of a #1 guide sample when running the magnetic tape MT.
  • first guide 15a and the second guide 15b are applied ones where a hardening treatment is dispensed to all surfaces thereof, the present invention is not limited thereto; for example, as shown in FIG. 8A, are available the first guide 15a and the second guide 15b, where the hardened layer H is formed on nothing but an inner surface I of the flange portion 15e arising from a periphery thereof.
  • the roller portion 15d and the flange portion 15e is configured of different members and the flange portion 15e, where a surface hardening treatment is dispensed, may be joined to the roller portion 15d.
  • the present invention is not limited thereto and a two-reel cartridge drive is also available.
  • a guide used for the magnetic tape drive of the present invention is applicable to one arranged within a magnetic tape cartridge.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Magnetic Record Carriers (AREA)
EP04015902A 2003-08-13 2004-07-06 Magnetbandlaufwerk Withdrawn EP1507258A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003292925A JP2005063565A (ja) 2003-08-13 2003-08-13 磁気テープドライブ
JP2003292925 2003-08-13

Publications (2)

Publication Number Publication Date
EP1507258A2 true EP1507258A2 (de) 2005-02-16
EP1507258A3 EP1507258A3 (de) 2007-09-12

Family

ID=33562791

Family Applications (1)

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EP04015902A Withdrawn EP1507258A3 (de) 2003-08-13 2004-07-06 Magnetbandlaufwerk

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US (1) US20050035241A1 (de)
EP (1) EP1507258A3 (de)
JP (1) JP2005063565A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5479289B2 (ja) * 2010-09-29 2014-04-23 富士フイルム株式会社 テープ案内部材

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007494A1 (de) * 1978-07-12 1980-02-06 BASF Aktiengesellschaft Führungseinrichtung für einen dünnen bandförmigen Aufzeichnungsträger, insbesondere für ein Magnetband
US4403720A (en) * 1982-02-05 1983-09-13 Bell & Howell Company Bidirectional tape advancing method and apparatus
US5157833A (en) * 1991-03-30 1992-10-27 Sanshin Industry Co., Ltd. Method for manufacturing tape guide for use in data cartridge
US5370292A (en) * 1990-08-29 1994-12-06 Matsushita Electric Industrial Co., Ltd. Magnetic tape driving mechanism having a capstan with a surface made of carbon film including diamond-bonded carbons
US5542593A (en) * 1993-02-17 1996-08-06 Verbatim Corporation Tape guides for magnetic tape equipment
JPH08321100A (ja) * 1995-05-26 1996-12-03 Sony Corp 磁気記録及び／又は再生装置
US20030075582A1 (en) * 2000-08-21 2003-04-24 Koninklijke Philips Electronics N.V. Recording and/or reproducing device comprising a coated tape guide
WO2003034423A1 (en) * 2001-10-18 2003-04-24 Hewlett-Packard Development Company, L.P. Recording and/or reproducing device comprising a coated tape guide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6447179B1 (en) * 1997-03-24 2002-09-10 Fuji Photo Film Co., Ltd. Conveying roller for photosensitive material and method of producing the same
CN1134776C (zh) * 1998-11-12 2004-01-14 皇家菲利浦电子有限公司 存储装置、存储容器以及存储系统
CN1365494A (zh) * 2000-02-24 2002-08-21 皇家菲利浦电子有限公司 具有受控制磁引力的磁带卷轴夹持装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007494A1 (de) * 1978-07-12 1980-02-06 BASF Aktiengesellschaft Führungseinrichtung für einen dünnen bandförmigen Aufzeichnungsträger, insbesondere für ein Magnetband
US4403720A (en) * 1982-02-05 1983-09-13 Bell & Howell Company Bidirectional tape advancing method and apparatus
US5370292A (en) * 1990-08-29 1994-12-06 Matsushita Electric Industrial Co., Ltd. Magnetic tape driving mechanism having a capstan with a surface made of carbon film including diamond-bonded carbons
US5157833A (en) * 1991-03-30 1992-10-27 Sanshin Industry Co., Ltd. Method for manufacturing tape guide for use in data cartridge
US5542593A (en) * 1993-02-17 1996-08-06 Verbatim Corporation Tape guides for magnetic tape equipment
JPH08321100A (ja) * 1995-05-26 1996-12-03 Sony Corp 磁気記録及び／又は再生装置
US20030075582A1 (en) * 2000-08-21 2003-04-24 Koninklijke Philips Electronics N.V. Recording and/or reproducing device comprising a coated tape guide
US6570740B1 (en) * 2000-08-21 2003-05-27 Hewlett-Packard Development Company, L.P. Tape guide with wear resistant coating
WO2003034423A1 (en) * 2001-10-18 2003-04-24 Hewlett-Packard Development Company, L.P. Recording and/or reproducing device comprising a coated tape guide

Also Published As

Publication number Publication date
US20050035241A1 (en) 2005-02-17
JP2005063565A (ja) 2005-03-10
EP1507258A3 (de) 2007-09-12

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